Brake valve device



Sept. 22, 1931. J. M. DAPRON BRAKE VALVE DEVICE Filed June s, 1929 AullHaw@ ' ATTORNEYy @mul NVENTOR JOSEPH M DAPRQN Patented Sept. 22, 1931 fUNITED "STATES ;PATENT: OFFICE JosEPIIMfEAPEoN, E s'r. LoUIs, MIssoUEI,AssIGNoR 'ro THE WESTINGHQUSE AIE BRAKE COMPANY, or WILMEEDING,PENNSYLVANIA, A. CORPORATION or PENN- SYLVANIA Application medium 3,

This invention relates to fluid pressure the brake valve devices for usewith such equipments. s, The principal object of my invention is toprovide an improved brake valve device by which the flow of fluidtherethrough, in applying and releasing the brakes, maybe so controlledas to eiect the gradual application In Yand release of the brakes.

In the accompanying drawings, Figure 1 is a diagrammatic view,partlyinsectiomof a portion of a fluid pressure brake equipmentembodying my invention, the brake valve dei vice being shown in releaseposition; F ig.

2 is a fragmental diagrammatic sectional view showing` the brakevalvedevice in serv` ice position g'Fig. 3 is a plan, viewof the face of therotary valve of the brake valve device;

o Fig. 4 is a plan view of the rotaryvalve seat,

and Fig. 5 is a plan view of a portion of the face of the rotary valveshowing a'modification of the service cavity therein.

As shown in the accompanying drawings ms my improved bra-ke valve devicehas been illustrated in combination with a fluid pressure brakeequipment comprising a main reservoir 2, an emergency valve device 3 anda brak'e cylinder 4, but it is to be understood that this equipment ismerely illustrative and that my brake valve device may be used withother types of equipments.

The brake valve device 1 may comprise a casing having a chamber 5containing a rotary valve 6 which is adapted to be operated through themedium of a handle 7 and a lstem or shaft 8 rotatably mounted in thecasing.

The face of the rotary valve 6 is provided with a service cavity 9 whichis of considerin able length and extends in a direction around therotary valve. This cavity varies in width from its narrowest portion atone end to its widest portion at its other end. Leading from the back ofthe rotary valve into "is the narrowest portion of the cavity is a serv'BRAKE VALVE kDEVICE 1929.` `seria; Np. 367,925.5. v

ice -port v10 of small-'diameter and leading l into the widest portion'ofthe cavity" is a service port 11 lhaving a diameter considerably 1greater than that of the port- 10. -In Fig. 3 the `width'of the cavityis varied in threefdistinct stages, but'it will be understood that thewidthy may be gradually varied asshown in-Fig. .l Leading from the faceof the rotary valve 6 to a chamber-12, formedinthe rotary'valve, is varelease port'l-S, which differs Afrom the 4usual release port in thatlit is elongatedat 14, whichelongation 'is of'varying width. f

' lIn operation, whenit is desired to effect a full service applicationof the brakes, the brake valve device 1 is operated'to full serviceposition in which the widest portion of the service cavity 9, inthe'rotary `valve 6, registers with the straight air passage 15, 'so

ythat fluidunderpresslire in thevalve chamber 5, as supplied from themain' reservoir@ througha pipe and passagel, is suppliedto the brakecylinder 4 ata fast rate, by way of the' ports 10 and 11 .in Lthegrotaryvalve, cavity 9, straight air passages andpi'pe 15, acavity 17 in theslide valveof the emergency valvedevice 3 anda passage and pipe 18;'

'v Should it be desired tov gradually effect the application' of thebrakes', the brake valve device is operated tothe first Iserviceposition* in which fluid `under pressure isl supplied to the4 brakecylinder ata slow rate,thr ough .the ports l0 andv in thedrotary ,valveVand the KAnarrovvest portion-of the cavity 9, the

lflow area of suchportion governing the rate at which thebralre cylinderpressure' is builtl up. It has beenfound that by" providing the port'lOin addition to thelportll, amore constant flow of Huid tothebralrecylinder ,is obtainedthan if the fluid y'were supplied through thelarger port 11 only and'then through the cavityk 9.' Should it bedesired toincreasethe rate of iiow oflluid under 'pressure tothe brakecylinder, the brake valve device is operated further toward'full rioservice position which causes a wider portion of the cavity 9 toregister with the passage 15 and consequently permits fluid to flow tothe brake-cylinder at a faster rate.

If it should be desired to release the brakes gradually the brake deviceis operated to the first release position in which the narrowest end ofthe release cavity registers with .the straight air passage 15` thusproviding for a slow release of fluid under pressure from the brakecvlinder 'to the atmosphere bv way of the chamber 12 in the rotary valveanda rpassage 19. To increase the rate of the flow'of fluid from thebrake c'vlinder the brake valve device is operated further toward re`lease position thus increasing the flow area through the rotarv valve.When thefbrake valve device is operated to full release position. Vtherotarv valve doesnot 4in anvgwav restrict the flow of Hui d from thebrake c vlfinderfand such fiowwill be ata fast rate.

- Tt 'will he noted from the foregoing-dewhich varies in with throughoutits length and through which fluid under pressure flows to effect anapplication of the brakes, and having two ports through which fluidunder pressure is supplied to said cavity, one of said ports leadinginto said cavity at its narrowest end and the other into the cavity atits widest end, said rotary valve and seat cooperating to vary the rateofthe flow of fluid from said cavity according to the position of therotary valve in effecting an application .of the brakes.

In testimony whereof I have hereunto set my hand, this 28th day of May,1929.

` Y VJOSEPH DAPRON.

serilption that with niv improved brake valve ,Y

.device an operator mbv lcyradiuitethe application and release of thebrakes withy a yfrreat deal 'more accuracv than hasbeen possible withthe use of the usual brake valve devices. which results in al moregentle handling 'of the car. Y l

In the drawings -fhereis shown sanding pipe'QO. anemergencv pipe 21. adoor closing `:pipe QQand a door opening pipe 23.-but since these pipesand their connections-are well Vknown and do not enter into theinvention as set forth in the appended claimsi a ldetailed descriptionthereof is deemed'unneceslsarv.

While one illustrative embodiment of the yinvention has been describedin detail. it is not inv intention to limit its: scope to l.that

embodimentl or otherwise than vby the terms -of 1Lhe appended claims.

Havinof now described niv inventionpwhat I claim `as-new and desire tosecure bv Letters Patent. is: i I

1. In a fluidpressure brake. the combination with a brake valve devicecomprising a casini?` having a seat for'a rotarv valve. of a rotarvvalve in said casing` having a cavitv Vwhich varies inwidthxthroughoutits length and through lwhich Huid under pressure flowsv`to effect an applicaiton of thebrakes` and having two ports ihrouicfhwhich fluid under pressure'is supplied iosaid cavitv, one of said portsleading into said cavitv at rits narrowest portionA and the otherleading into the cavitv 1 .at a wider portion. said rotary valve and`valve seat eooperatinef to varv the rater of the How of fluidr fromsaidcavity as said rotary valve is operated to efl'ectan application:of'thebrakes. .Y f

2. Ina fluid pressure brake, the combination with a. brake valve devicecomprising a lcasing having aseat fora rotary valve, of a rotary valvein l said casing having a cavity.

